What is event handler in oopsand why we need it and how to use it ?
Hi everyone ,
I am new to sdn.I did not understand event handler in oops .Please replay to this .
Thanks & Regards,
Sudeep Subudhi.
Moderator Message: Welcome to SDN. Please read the [Forum Rules of Engagment|Welcome and Rules of Engagement; before posting your question.
Edited by: Suhas Saha on Jan 9, 2012 2:51 PM
EDIT: BAH! I posted too slow... but there is still some information about saving and clearing in there
Its for making a playlist while your 'on the go'. So you click and hold the middle button the selected song (or album) should flash... Then you go into the playlist menu (music>playlists>on-the-go) and use it like any normal playlist...
When there's songs on the playlist it gives you the option to save or clear at the end of the song list, you select either one and it'll ask for conformation.
It works in both manually sync and auto sync mode. But if you have it on auto sync the play list will be created in iTunes...
So I'm not sure why you don't see songs in it after yo assign them to it, try sending a whole album and then music>playlists>on-the-go the album songs should be listed.
As for reasons to use it well maybe while out and about you realise that you want to hear from two artists at the same time, Radiohead and Bowie, in a shuffle mode. You could make it a on-the-go playlist. Or there's a few podcasts you want to hear in order... so you go down the list and assign them to on-the-go.
Some people use the On the go to note songs that need to be looked at in iTunes later, maybe because its too quiet, badly imported or they don't understand how such a bad song found its way onto the iPod.
Once you save it if you try and put more songs to it, 'on-the-go-1' will be created.
-hope this helps
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Why and how to use events in abap objects
Dear all,
Please explain me why and how to use events in abap objects with real time example
regards
pankaj giriHi Pankaj,
I will try to explain why to use events... How to use is a different topic.. which others have already answered...
This is same from your prev. post...
Events :
Technically speaking :
" Events are notifications an object receives from, or transmits to, other objects or applications. Events allow objects to perform actions whenever a specific occurrence takes place. Microsoft Windows is an event-driven operating system, events can come from other objects, applications, or user input such as mouse clicks or key presses. "
Lets say you have an ALV - An editable one ...
Lats say - Once you press some button you want some kind of validation to be done.
How to do this ?
Raise an Event - Which is handled by a method and write the validation code.
Now you might argue, that I can do it in this way : Capture the function code - and call the validate method.
Yes, in this case it can be done.. But lets say .. you change a field in the ALV and you want the validation to be done as soon as he is done with typing.
Where is the function code here ? No function code... But there is an event here - The data changed event.
So you can raise a data changed event that can be handled and will do the validation.
It is not user friendly that you ask the user to press a button (to get the function code) for validation each time he enters a data.
The events can be raised by a system, or by a program also. So in this case the data changed event is raised by a system that you can handle.
Also, Lets say on a particular action you want some code to trigger. (You can take the same example of validation code). In this case the code to trigger is in a separate class. The object of which is not available here at this moment. (This case happens very frequently).
Advantage with events : Event handlers can be in a separate class also.
e.g : In the middle of some business logic .. you encounter a error. You want to send this information to the UI (to user - in form of a pop up) and then continue with some processing.
In many cases - A direct method call to trigger the pop up is not done. Because (in ideal cases) the engine must not interact with UI directly - Because the UI could be some other application - like a windows UI but the error comes from some SAP program.
So - A event is raised from the engine that is handled in the UI and a pop up is triggered.
Here -- I would have different classes (lets say for different Operating Systems). And all these classes must register to the event ERROR raised in application.
And these different classes for different Operation systems will have different code to raise a pop-up.
Now you can imagine : If you coded a pop-up for Windows (in your application logic) .. it will not work for Mac or Linux. But of you raise a event.. that is handled separately by a different UI classes for Win, Linux or Mac they will catch this event and process accordingly.
May be I complicated this explanation .... but I couldn't think of a simpler and concrete example.
Cheers.
Varun. -
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OTEDIT: BAH! I posted too slow... but there is still some information about saving and clearing in there
Its for making a playlist while your 'on the go'. So you click and hold the middle button the selected song (or album) should flash... Then you go into the playlist menu (music>playlists>on-the-go) and use it like any normal playlist...
When there's songs on the playlist it gives you the option to save or clear at the end of the song list, you select either one and it'll ask for conformation.
It works in both manually sync and auto sync mode. But if you have it on auto sync the play list will be created in iTunes...
So I'm not sure why you don't see songs in it after yo assign them to it, try sending a whole album and then music>playlists>on-the-go the album songs should be listed.
As for reasons to use it well maybe while out and about you realise that you want to hear from two artists at the same time, Radiohead and Bowie, in a shuffle mode. You could make it a on-the-go playlist. Or there's a few podcasts you want to hear in order... so you go down the list and assign them to on-the-go.
Some people use the On the go to note songs that need to be looked at in iTunes later, maybe because its too quiet, badly imported or they don't understand how such a bad song found its way onto the iPod.
Once you save it if you try and put more songs to it, 'on-the-go-1' will be created.
-hope this helps -
Why and how we use Logical Database?
Can anybody explain with example why and how we use logical database?
Regards,
RajanHello,
SAP comes loaded with all the extras. Among the extras that are most helpful to IT managers are all the access routines needed to pull any business object that managers can think of out of SAP databases. However, SAP has not thought of everything where your particular applications are concerned. SAP organizes its standard database tables to service business units based on conventional business applications. Itu2019s likely your business requires something new, perhaps even something exotic. In that case, you will need to create a new database, using information from different places. Basically, you need a logical database. You need to create a virtual business data object repository consisting of a new kind of record or table that suits your purposes. In addition, the repository should be composed of information that is actually stored in a number of different locations, none of them necessarily logically associated with one another. Letu2019s take a closer look at creating logical databases.
A case for a logical database
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Regards
Arindam -
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Dartiesdad wrote:
Hmmmm Snow Leopard and iCloud.... not usually workable but here is an article that might be helpful.
http://reviews.cnet.com/8301-13727_7-57511534-263/how-to-set-up-icloud-services- in-snow-leopard/
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jcburbank wrote:
I've tried deleting the album from both the phone and from iTunes and then redownloading them to both and the same problem occurs.
If you're re-downloading an album to iTunes and your iPhone, that may perpetuate the problem. What happens if you completely delete every copy of the album, then just download to your iTunes library and then sync the album to your iPhone from your library? That should put only one copy on your iPhone.
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